But isn't "enticing" in the eye of the beholder? Or is it something that is hard-coded into our brains? If former, then your argument is invalid, if latter, then better jail us all.
This is why porn tends to produce ever more harcore content, to satisfy the ever increasing cravings of the watchers. Just look at a 70's porn movie and the average one today. Much more enticing and hardcore.
As a result, allowing people to develop a taste for CSAM is pandora's box we shouldn't open.